Mercurial > projects > ldc
annotate gen/tocall.cpp @ 468:45a67b6f1310
Removed the 'needsstorage' thing from Dsymbol. Arguments are not always given storage when applicable. This is not longer treat specially
in this regard. Code for accessing nested variables and contexts rewritten. Probably more. Fairly well tested.
author | Tomas Lindquist Olsen <tomas.l.olsen@gmail.com> |
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date | Mon, 04 Aug 2008 02:59:34 +0200 |
parents | b975f29b7256 |
children | 672eb4893b55 |
rev | line source |
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1 #include "gen/llvm.h" |
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2 |
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3 #include "mtype.h" |
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4 #include "declaration.h" |
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5 |
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6 #include "gen/tollvm.h" |
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7 #include "gen/llvmhelpers.h" |
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8 #include "gen/irstate.h" |
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9 #include "gen/dvalue.h" |
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10 #include "gen/functions.h" |
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11 |
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12 #include "gen/logger.h" |
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13 |
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14 ////////////////////////////////////////////////////////////////////////////////////////// |
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15 |
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16 TypeFunction* DtoTypeFunction(DValue* fnval) |
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17 { |
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18 Type* type = fnval->getType()->toBasetype(); |
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19 if (type->ty == Tfunction) |
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20 { |
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21 return (TypeFunction*)type; |
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22 } |
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23 else if (type->ty == Tdelegate) |
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24 { |
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25 assert(type->next->ty == Tfunction); |
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26 return (TypeFunction*)type->next; |
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27 } |
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28 |
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29 assert(0 && "cant get TypeFunction* from non lazy/function/delegate"); |
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30 return 0; |
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31 } |
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32 |
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33 ////////////////////////////////////////////////////////////////////////////////////////// |
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34 |
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35 unsigned DtoCallingConv(LINK l) |
347
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36 { |
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37 if (l == LINKc || l == LINKcpp) |
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38 return llvm::CallingConv::C; |
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39 else if (l == LINKd || l == LINKdefault) |
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40 return llvm::CallingConv::Fast; |
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41 else if (l == LINKwindows) |
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42 return llvm::CallingConv::X86_StdCall; |
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43 else |
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44 assert(0 && "Unsupported calling convention"); |
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45 } |
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46 |
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47 ////////////////////////////////////////////////////////////////////////////////////////// |
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48 |
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49 DValue* DtoVaArg(Loc& loc, Type* type, Expression* valistArg) |
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50 { |
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51 DValue* expelem = valistArg->toElem(gIR); |
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52 const LLType* llt = DtoType(type); |
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53 if (DtoIsPassedByRef(type)) |
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54 llt = getPtrToType(llt); |
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55 // issue a warning for broken va_arg instruction. |
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56 if (global.params.cpu != ARCHx86) |
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57 warning("%s: va_arg for C variadic functions is probably broken for anything but x86", loc.toChars()); |
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58 // done |
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59 return new DImValue(type, gIR->ir->CreateVAArg(expelem->getLVal(), llt, "tmp")); |
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60 } |
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61 |
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62 ////////////////////////////////////////////////////////////////////////////////////////// |
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63 |
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64 LLValue* DtoCallableValue(DValue* fn) |
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65 { |
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66 Type* type = fn->getType()->toBasetype(); |
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67 if (type->ty == Tfunction) |
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68 { |
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69 return fn->getRVal(); |
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70 } |
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71 else if (type->ty == Tdelegate) |
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72 { |
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73 LLValue* dg = fn->getRVal(); |
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74 LLValue* funcptr = DtoGEPi(dg, 0, 1); |
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75 return DtoLoad(funcptr); |
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76 } |
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77 else |
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78 { |
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79 assert(0 && "not a callable type"); |
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80 return NULL; |
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81 } |
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82 } |
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83 |
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84 ////////////////////////////////////////////////////////////////////////////////////////// |
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85 |
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86 const LLFunctionType* DtoExtractFunctionType(const LLType* type) |
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87 { |
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88 if (const LLFunctionType* fty = isaFunction(type)) |
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89 return fty; |
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90 else if (const LLPointerType* pty = isaPointer(type)) |
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91 { |
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92 if (const LLFunctionType* fty = isaFunction(pty->getElementType())) |
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93 return fty; |
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94 } |
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95 return NULL; |
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96 } |
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97 |
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98 ////////////////////////////////////////////////////////////////////////////////////////// |
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99 |
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100 void DtoBuildDVarArgList(std::vector<LLValue*>& args, llvm::PAListPtr& palist, TypeFunction* tf, Expressions* arguments, size_t argidx) |
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101 { |
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102 Logger::println("doing d-style variadic arguments"); |
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103 |
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104 std::vector<const LLType*> vtypes; |
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105 |
414
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106 // number of non variadic args |
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107 int begin = tf->parameters->dim; |
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108 Logger::println("num non vararg params = %d", begin); |
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109 |
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110 // build struct with argument types (non variadic args) |
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111 for (int i=begin; i<arguments->dim; i++) |
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112 { |
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113 Expression* argexp = (Expression*)arguments->data[i]; |
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114 vtypes.push_back(DtoType(argexp->type)); |
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115 size_t sz = getABITypeSize(vtypes.back()); |
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116 if (sz < PTRSIZE) |
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117 vtypes.back() = DtoSize_t(); |
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118 } |
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119 const LLStructType* vtype = LLStructType::get(vtypes); |
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120 Logger::cout() << "d-variadic argument struct type:\n" << *vtype << '\n'; |
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121 LLValue* mem = new llvm::AllocaInst(vtype,"_argptr_storage",gIR->topallocapoint()); |
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122 |
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123 // store arguments in the struct |
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124 for (int i=begin,k=0; i<arguments->dim; i++,k++) |
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125 { |
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126 Expression* argexp = (Expression*)arguments->data[i]; |
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127 if (global.params.llvmAnnotate) |
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128 DtoAnnotation(argexp->toChars()); |
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129 LLValue* argdst = DtoGEPi(mem,0,k); |
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130 argdst = DtoBitCast(argdst, getPtrToType(DtoType(argexp->type))); |
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131 DtoVariadicArgument(argexp, argdst); |
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132 } |
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133 |
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134 // build type info array |
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135 assert(Type::typeinfo->ir.irStruct->constInit); |
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136 const LLType* typeinfotype = DtoType(Type::typeinfo->type); |
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137 const LLArrayType* typeinfoarraytype = LLArrayType::get(typeinfotype,vtype->getNumElements()); |
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138 |
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139 llvm::GlobalVariable* typeinfomem = |
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140 new llvm::GlobalVariable(typeinfoarraytype, true, llvm::GlobalValue::InternalLinkage, NULL, "._arguments.storage", gIR->module); |
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141 Logger::cout() << "_arguments storage: " << *typeinfomem << '\n'; |
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142 |
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143 std::vector<LLConstant*> vtypeinfos; |
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144 for (int i=begin,k=0; i<arguments->dim; i++,k++) |
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145 { |
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146 Expression* argexp = (Expression*)arguments->data[i]; |
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147 vtypeinfos.push_back(DtoTypeInfoOf(argexp->type)); |
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148 } |
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149 |
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150 // apply initializer |
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151 LLConstant* tiinits = llvm::ConstantArray::get(typeinfoarraytype, vtypeinfos); |
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152 typeinfomem->setInitializer(tiinits); |
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153 |
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154 // put data in d-array |
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155 std::vector<LLConstant*> pinits; |
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156 pinits.push_back(DtoConstSize_t(vtype->getNumElements())); |
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157 pinits.push_back(llvm::ConstantExpr::getBitCast(typeinfomem, getPtrToType(typeinfotype))); |
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158 const LLType* tiarrty = DtoType(Type::typeinfo->type->arrayOf()); |
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159 tiinits = llvm::ConstantStruct::get(pinits); |
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160 LLValue* typeinfoarrayparam = new llvm::GlobalVariable(tiarrty, |
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161 true, llvm::GlobalValue::InternalLinkage, tiinits, "._arguments.array", gIR->module); |
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162 |
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163 // specify arguments |
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164 args.push_back(typeinfoarrayparam); |
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165 ++argidx; |
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166 args.push_back(gIR->ir->CreateBitCast(mem, getPtrToType(LLType::Int8Ty), "tmp")); |
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167 ++argidx; |
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168 |
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169 // pass non variadic args |
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170 for (int i=0; i<begin; i++) |
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171 { |
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172 Argument* fnarg = Argument::getNth(tf->parameters, i); |
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173 DValue* argval = DtoArgument(fnarg, (Expression*)arguments->data[i]); |
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174 args.push_back(argval->getRVal()); |
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175 |
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176 if (fnarg->llvmAttrs) |
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177 palist = palist.addAttr(argidx, fnarg->llvmAttrs); |
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178 |
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179 ++argidx; |
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180 } |
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181 } |
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182 |
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183 |
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184 DValue* DtoCallFunction(Loc& loc, Type* resulttype, DValue* fnval, Expressions* arguments) |
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185 { |
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186 // the callee D type |
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187 Type* calleeType = fnval->getType(); |
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188 |
456
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189 // if the type has not yet been processed, do so now |
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190 if (calleeType->ir.type == NULL) |
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191 DtoType(calleeType); |
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192 |
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193 // get func value if any |
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194 DFuncValue* dfnval = fnval->isFunc(); |
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195 |
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196 // handle special vararg intrinsics |
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197 bool va_intrinsic = (dfnval && dfnval->func && dfnval->func->isVaIntrinsic()); |
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198 |
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199 // get function type info |
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200 TypeFunction* tf = DtoTypeFunction(fnval); |
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201 |
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202 // misc |
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203 bool retinptr = tf->llvmRetInPtr; |
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204 bool usesthis = tf->llvmUsesThis; |
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205 bool delegatecall = (calleeType->toBasetype()->ty == Tdelegate); |
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206 bool nestedcall = (dfnval && dfnval->func && dfnval->func->isNested()); |
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207 bool dvarargs = (tf->linkage == LINKd && tf->varargs == 1); |
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208 |
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209 unsigned callconv = DtoCallingConv(tf->linkage); |
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210 |
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211 // get callee llvm value |
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212 LLValue* callable = DtoCallableValue(fnval); |
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213 const LLFunctionType* callableTy = DtoExtractFunctionType(callable->getType()); |
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214 assert(callableTy); |
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215 |
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216 // get llvm argument iterator, for types |
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217 LLFunctionType::param_iterator argbegin = callableTy->param_begin(); |
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218 LLFunctionType::param_iterator argiter = argbegin; |
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219 |
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220 // parameter attributes |
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221 llvm::PAListPtr palist; |
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222 |
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223 // return attrs |
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224 if (tf->llvmRetAttrs) |
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225 palist = palist.addAttr(0, tf->llvmRetAttrs); |
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226 |
414
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227 // handle implicit arguments |
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228 std::vector<LLValue*> args; |
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229 |
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230 // return in hidden ptr is first |
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231 if (retinptr) |
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232 { |
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233 LLValue* retvar = new llvm::AllocaInst(argiter->get()->getContainedType(0), ".rettmp", gIR->topallocapoint()); |
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234 ++argiter; |
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235 args.push_back(retvar); |
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236 palist = palist.addAttr(1, llvm::ParamAttr::StructRet); |
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237 } |
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238 |
422
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239 // then comes a context argument... |
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240 if(usesthis || delegatecall || nestedcall) |
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241 { |
422
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242 // ... which can be a 'this' argument |
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243 if (dfnval && dfnval->vthis) |
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244 { |
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245 LLValue* thisarg = DtoBitCast(dfnval->vthis, argiter->get()); |
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246 ++argiter; |
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247 args.push_back(thisarg); |
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248 } |
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249 // ... or a delegate context arg |
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250 else if (delegatecall) |
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251 { |
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252 LLValue* ctxarg = DtoLoad(DtoGEPi(fnval->getRVal(), 0,0)); |
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253 assert(ctxarg->getType() == argiter->get()); |
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254 ++argiter; |
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255 args.push_back(ctxarg); |
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256 } |
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257 // ... or a nested function context arg |
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258 else if (nestedcall) |
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259 { |
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260 LLValue* contextptr = DtoNestedContext(dfnval->func->toParent2()->isFuncDeclaration()); |
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261 if (!contextptr) |
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262 contextptr = getNullPtr(getVoidPtrType()); |
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263 else |
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264 contextptr = DtoBitCast(contextptr, getVoidPtrType()); |
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265 ++argiter; |
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266 args.push_back(contextptr); |
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267 } |
414
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268 else |
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269 { |
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270 error(loc, "Context argument required but none given"); |
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271 fatal(); |
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272 } |
414
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273 } |
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274 |
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275 // handle the rest of the arguments based on param passing style |
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276 |
414
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277 // variadic instrinsics need some custom casts |
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278 if (va_intrinsic) |
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279 { |
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280 size_t n = arguments->dim; |
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281 for (int i=0; i<n; i++) |
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282 { |
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283 Expression* exp = (Expression*)arguments->data[i]; |
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284 DValue* expelem = exp->toElem(gIR); |
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285 // cast to va_list* |
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286 LLValue* val = DtoBitCast(expelem->getLVal(), getVoidPtrType()); |
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287 ++argiter; |
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288 args.push_back(val); |
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289 } |
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290 } |
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291 |
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292 // d style varargs needs a few more hidden arguments as well as special passing |
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293 else if (dvarargs) |
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294 { |
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295 DtoBuildDVarArgList(args, palist, tf, arguments, argiter-argbegin+1); |
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296 } |
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297 |
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298 // otherwise we're looking at a normal function call |
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299 else |
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300 { |
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301 Logger::println("doing normal arguments"); |
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302 for (int i=0; i<arguments->dim; i++) { |
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303 int j = argiter-argbegin; |
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304 Argument* fnarg = Argument::getNth(tf->parameters, i); |
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305 DValue* argval = DtoArgument(fnarg, (Expression*)arguments->data[i]); |
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306 LLValue* arg = argval->getRVal(); |
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307 if (fnarg) // can fnarg ever be null in this block? |
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308 { |
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309 if (arg->getType() != callableTy->getParamType(j)) |
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310 arg = DtoBitCast(arg, callableTy->getParamType(j)); |
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311 if (fnarg->llvmAttrs) |
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312 palist = palist.addAttr(j+1, fnarg->llvmAttrs); |
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313 } |
414
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314 ++argiter; |
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315 args.push_back(arg); |
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316 } |
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317 } |
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318 |
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319 #if 0 |
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320 Logger::println("%d params passed", n); |
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321 for (int i=0; i<args.size(); ++i) { |
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322 assert(args[i]); |
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323 Logger::cout() << "arg["<<i<<"] = " << *args[i] << '\n'; |
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324 } |
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325 #endif |
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326 |
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327 // void returns cannot not be named |
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328 const char* varname = ""; |
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329 if (callableTy->getReturnType() != LLType::VoidTy) |
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330 varname = "tmp"; |
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331 |
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332 //Logger::cout() << "Calling: " << *funcval << '\n'; |
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333 |
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334 // call the function |
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335 CallOrInvoke* call = gIR->CreateCallOrInvoke(callable, args.begin(), args.end(), varname); |
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336 |
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337 // get return value |
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338 LLValue* retllval = (retinptr) ? args[0] : call->get(); |
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339 |
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340 // if the type of retllval is abstract, refine to concrete |
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341 if (retllval->getType()->isAbstract()) |
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342 retllval = DtoBitCast(retllval, getPtrToType(DtoType(resulttype)), "retval"); |
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343 |
445
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344 // set calling convention and parameter attributes |
414
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345 if (dfnval && dfnval->func) |
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346 { |
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347 LLFunction* llfunc = llvm::dyn_cast<LLFunction>(dfnval->val); |
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348 if (llfunc && llfunc->isIntrinsic()) |
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349 palist = llvm::Intrinsic::getParamAttrs((llvm::Intrinsic::ID)llfunc->getIntrinsicID()); |
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350 else |
414
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351 call->setCallingConv(callconv); |
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352 } |
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353 else |
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354 call->setCallingConv(callconv); |
347
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355 call->setParamAttrs(palist); |
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356 |
414
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357 return new DImValue(resulttype, retllval, false); |
347
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358 } |
414
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359 |
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360 |
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361 |
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362 |
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363 |
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364 |
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365 |
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366 |
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367 |
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368 |
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369 |
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370 |
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371 |